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| 型號(hào)： | MC9S08RC8CFJ |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁(yè)數(shù)： | 107/232頁(yè) |
| 文件大?。?/td> | 2818K |
| 代理商： | MC9S08RC8CFJ |
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SoC Guide — MC9S08RG60/D V1.08
MOTOROLA
195
MC9S08RC/RD/RE/RG
14.4.4 Tag vs. Force Breakpoints and Triggers
Tagging is a term that refers to identifying an instruction opcode as it is fetched into the instruction queue,
but not taking any other action until and unless that instruction is actually executed by the CPU. This
distinction is important because any change-of-flow from a jump, branch, subroutine call, or interrupt
causes some instructions that have been fetched into the instruction queue to be thrown away without being
executed.
A force-type breakpoint waits for the current instruction to finish and then acts upon the breakpoint
request. The usual action in response to a breakpoint is to go to active background mode rather than
continuing to the next instruction in the user application program.
The tag vs. force terminology is used in two contexts within the debug module. The first context refers to
breakpoint requests from the debug module to the CPU. The second refers to match signals from the
comparators to the debugger control logic. When a tag-type break request is sent to the CPU, a signal is
entered into the instruction queue along with the opcode so that if/when this opcode ever executes, the
CPU will effectively replace the tagged opcode with a BGND opcode so the CPU goes to active
background mode rather than executing the tagged instruction. When the TRGSEL control bit in the
DBGT register is set to select tag-type operation, the output from comparator A or B is qualified by a block
of logic in the debug module that tracks opcodes and only produces a trigger to the debugger if the opcode
at the compare address is actually executed. There is separate opcode tracking logic for each comparator
so more than one compare event can be tracked through the instruction queue at a time.
14.4.5 Trigger Modes
The trigger mode controls the overall behavior of a debug run. The 4-bit TRG field in the DBGT register
selects one of nine trigger modes. When TRGSEL = 1 in the DBGT register, the output of the comparator
must propagate through an opcode tracking circuit before triggering FIFO actions. The BEGIN bit in
DBGT chooses whether the FIFO begins storing data when the qualified trigger is detected (begin trace),
or the FIFO stores data in a circular fashion from the time it is armed until the qualified trigger is detected
(end trigger).
A debug run is started by writing a 1 to the ARM bit in the DBGC register, which sets the ARMF flag and
clears the AF and BF flags and the CNT bits in DBGS. A begin-trace debug run ends when the FIFO gets
full. An end-trace run ends when the selected trigger event occurs. Any debug run can be stopped manually
by writing a 0 to the ARM bit or DBGEN bit in DBGC.
In all trigger modes except event-only modes, the FIFO stores change-of-flow addresses. In event-only
trigger modes, the FIFO stores data in the low-order eight bits of the FIFO.
The BEGIN control bit is ignored in event-only trigger modes and all such debug runs are begin type
traces. When TRGSEL = 1 to select opcode fetch triggers, it is not necessary to use R/W in comparisons
because opcode tags would only apply to opcode fetches that are always read cycles. It would also be
unusual to specify TRGSEL = 1 while using a full mode trigger because the opcode value is normally
known at a particular address.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC9S08RC8CFJE | 功能描述:IC MCU 8K FLASH 8MHZ 32-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:S08 標(biāo)準(zhǔn)包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設(shè)備:- 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:8KB（8K x 8） 程序存儲(chǔ)器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱:864285 |
| MC9S08RC8CPE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC9S08RC8DWE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC9S08RC8FDE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC9S08RC8FG | 制造商:Rochester Electronics LLC 功能描述:8 BIT,8K FLASH - Bulk |
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